# git rev-parse -q --verify 24321ac668e452a4942598533d267805f291fdc9^{commit}
24321ac668e452a4942598533d267805f291fdc9
already have revision, skipping fetch
# git checkout -q -f -B kisskb 24321ac668e452a4942598533d267805f291fdc9
# git clean -qxdf
# < git log -1
# commit 24321ac668e452a4942598533d267805f291fdc9
# Author: Raoni Fassina Firmino <raoni@linux.ibm.com>
# Date:   Mon Feb 1 17:05:05 2021 -0300
# 
#     powerpc/64/signal: Fix regression in __kernel_sigtramp_rt64() semantics
#     
#     Commit 0138ba5783ae ("powerpc/64/signal: Balance return predictor
#     stack in signal trampoline") changed __kernel_sigtramp_rt64() VDSO and
#     trampoline code, and introduced a regression in the way glibc's
#     backtrace()[1] detects the signal-handler stack frame. Apart from the
#     practical implications, __kernel_sigtramp_rt64() was a VDSO function
#     with the semantics that it is a function you can call from userspace
#     to end a signal handling. Now this semantics are no longer valid.
#     
#     I believe the aforementioned change affects all releases since 5.9.
#     
#     This patch tries to fix both the semantics and practical aspect of
#     __kernel_sigtramp_rt64() returning it to the previous code, whilst
#     keeping the intended behaviour of 0138ba5783ae by adding a new symbol
#     to serve as the jump target from the kernel to the trampoline. Now the
#     trampoline has two parts, a new entry point and the old return point.
#     
#     [1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-January/223194.html
#     
#     Fixes: 0138ba5783ae ("powerpc/64/signal: Balance return predictor stack in signal trampoline")
#     Cc: stable@vger.kernel.org # v5.9+
#     Signed-off-by: Raoni Fassina Firmino <raoni@linux.ibm.com>
#     Acked-by: Nicholas Piggin <npiggin@gmail.com>
#     [mpe: Minor tweaks to change log formatting, add stable tag]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20210201200505.iz46ubcizipnkcxe@work-tp
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-ld --version
# < git log --format=%s --max-count=1 24321ac668e452a4942598533d267805f291fdc9
# < make -s -j 24 ARCH=ia64 O=/kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  defconfig
arch/ia64/configs/generic_defconfig:58:warning: override: reassigning to symbol ATA
arch/ia64/configs/generic_defconfig:59:warning: override: reassigning to symbol ATA_PIIX
# < make -s -j 24 ARCH=ia64 O=/kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  help
# make -s -j 24 ARCH=ia64 O=/kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  olddefconfig
# make -s -j 24 ARCH=ia64 O=/kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
In file included from /kisskb/src/include/linux/numa.h:25:0,
                 from /kisskb/src/include/linux/nodemask.h:96,
                 from /kisskb/src/lib/nodemask.c:2:
/kisskb/src/arch/ia64/include/asm/sparsemem.h:14:40: warning: "PAGE_SHIFT" is not defined [-Wundef]
 #if ((CONFIG_FORCE_MAX_ZONEORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS)
                                        ^
In file included from /kisskb/src/include/linux/gfp.h:6:0,
                 from /kisskb/src/include/linux/umh.h:4,
                 from /kisskb/src/include/linux/kmod.h:9,
                 from /kisskb/src/include/linux/module.h:16,
                 from /kisskb/src/lib/nodemask.c:3:
/kisskb/src/include/linux/mmzone.h:1156:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
  ^
make[2]: *** [/kisskb/src/scripts/Makefile.build:279: lib/nodemask.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1805: lib] Error 2
make[1]: *** Waiting for unfinished jobs....
In file included from /kisskb/src/arch/ia64/include/uapi/asm/intrinsics.h:22:0,
                 from /kisskb/src/arch/ia64/include/asm/intrinsics.h:11,
                 from /kisskb/src/arch/ia64/include/asm/timex.h:14,
                 from /kisskb/src/include/linux/timex.h:65,
                 from /kisskb/src/include/linux/time32.h:13,
                 from /kisskb/src/include/linux/time.h:60,
                 from /kisskb/src/fs/nfs/read.c:11:
/kisskb/src/fs/nfs/read.c: In function 'nfs_read_completion':
/kisskb/src/arch/ia64/include/uapi/asm/cmpxchg.h:57:2: warning: value computed is not used [-Wunused-value]
 ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
  ^
/kisskb/src/fs/nfs/read.c:196:5: note: in expansion of macro 'xchg'
     xchg(&nfs_req_openctx(req)->error, error);
     ^
/kisskb/src/fs/nfs/read.c: In function 'nfs_readpage':
/kisskb/src/arch/ia64/include/uapi/asm/cmpxchg.h:57:2: warning: value computed is not used [-Wunused-value]
 ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
  ^
/kisskb/src/fs/nfs/read.c:355:2: note: in expansion of macro 'xchg'
  xchg(&ctx->error, 0);
  ^
In file included from /kisskb/src/include/linux/numa.h:25:0,
                 from /kisskb/src/include/linux/async.h:13,
                 from /kisskb/src/kernel/async.c:47:
/kisskb/src/arch/ia64/include/asm/sparsemem.h:14:40: warning: "PAGE_SHIFT" is not defined [-Wundef]
 #if ((CONFIG_FORCE_MAX_ZONEORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS)
                                        ^
In file included from /kisskb/src/include/linux/gfp.h:6:0,
                 from /kisskb/src/include/linux/xarray.h:14,
                 from /kisskb/src/include/linux/radix-tree.h:19,
                 from /kisskb/src/include/linux/idr.h:15,
                 from /kisskb/src/include/linux/kernfs.h:13,
                 from /kisskb/src/include/linux/sysfs.h:16,
                 from /kisskb/src/include/linux/kobject.h:20,
                 from /kisskb/src/include/linux/energy_model.h:7,
                 from /kisskb/src/include/linux/device.h:16,
                 from /kisskb/src/include/linux/async.h:14,
                 from /kisskb/src/kernel/async.c:47:
/kisskb/src/include/linux/mmzone.h:1156:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
  ^
make[2]: *** [/kisskb/src/scripts/Makefile.build:279: kernel/async.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1805: kernel] Error 2
In file included from /kisskb/src/include/linux/numa.h:25:0,
                 from /kisskb/src/include/linux/async.h:13,
                 from /kisskb/src/drivers/acpi/battery.c:13:
/kisskb/src/arch/ia64/include/asm/sparsemem.h:14:40: warning: "PAGE_SHIFT" is not defined [-Wundef]
 #if ((CONFIG_FORCE_MAX_ZONEORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS)
                                        ^
In file included from /kisskb/src/include/linux/gfp.h:6:0,
                 from /kisskb/src/include/linux/xarray.h:14,
                 from /kisskb/src/include/linux/radix-tree.h:19,
                 from /kisskb/src/include/linux/idr.h:15,
                 from /kisskb/src/include/linux/kernfs.h:13,
                 from /kisskb/src/include/linux/sysfs.h:16,
                 from /kisskb/src/include/linux/kobject.h:20,
                 from /kisskb/src/include/linux/energy_model.h:7,
                 from /kisskb/src/include/linux/device.h:16,
                 from /kisskb/src/include/linux/async.h:14,
                 from /kisskb/src/drivers/acpi/battery.c:13:
/kisskb/src/include/linux/mmzone.h:1156:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
  ^
make[3]: *** [/kisskb/src/scripts/Makefile.build:279: drivers/acpi/battery.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/kisskb/src/scripts/Makefile.build:496: drivers/acpi] Error 2
make[2]: *** Waiting for unfinished jobs....
In file included from /kisskb/src/include/linux/numa.h:25:0,
                 from /kisskb/src/include/linux/async.h:13,
                 from /kisskb/src/drivers/base/bus.c:11:
/kisskb/src/arch/ia64/include/asm/sparsemem.h:14:40: warning: "PAGE_SHIFT" is not defined [-Wundef]
 #if ((CONFIG_FORCE_MAX_ZONEORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS)
                                        ^
In file included from /kisskb/src/include/linux/gfp.h:6:0,
                 from /kisskb/src/include/linux/xarray.h:14,
                 from /kisskb/src/include/linux/radix-tree.h:19,
                 from /kisskb/src/include/linux/idr.h:15,
                 from /kisskb/src/include/linux/kernfs.h:13,
                 from /kisskb/src/include/linux/sysfs.h:16,
                 from /kisskb/src/include/linux/kobject.h:20,
                 from /kisskb/src/include/linux/energy_model.h:7,
                 from /kisskb/src/include/linux/device.h:16,
                 from /kisskb/src/include/linux/async.h:14,
                 from /kisskb/src/drivers/base/bus.c:11:
/kisskb/src/include/linux/mmzone.h:1156:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
  ^
make[3]: *** [/kisskb/src/scripts/Makefile.build:279: drivers/base/bus.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/kisskb/src/scripts/Makefile.build:496: drivers/base] Error 2
In file included from /kisskb/src/include/linux/numa.h:25:0,
                 from /kisskb/src/include/linux/nodemask.h:96,
                 from /kisskb/src/include/linux/mount.h:15,
                 from /kisskb/src/fs/pnode.c:9:
/kisskb/src/arch/ia64/include/asm/sparsemem.h:14:40: warning: "PAGE_SHIFT" is not defined [-Wundef]
 #if ((CONFIG_FORCE_MAX_ZONEORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS)
                                        ^
In file included from /kisskb/src/include/linux/gfp.h:6:0,
                 from /kisskb/src/include/linux/xarray.h:14,
                 from /kisskb/src/include/linux/radix-tree.h:19,
                 from /kisskb/src/include/linux/fs.h:15,
                 from /kisskb/src/fs/pnode.c:10:
/kisskb/src/include/linux/mmzone.h:1156:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
  ^
make[2]: *** [/kisskb/src/scripts/Makefile.build:279: fs/pnode.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1805: fs] Error 2
make[1]: *** [/kisskb/src/Makefile:1805: drivers] Error 2
make: *** [Makefile:185: __sub-make] Error 2
Command 'make -s -j 24 ARCH=ia64 O=/kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/ia64-linux/bin/ia64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-fixes_ia64-defconfig_ia64-gcc4.9
# Build took: 0:02:03.586869